Giffard Caramel Toffee liqueur is considered one of their "modern" style spirits. It is meant to emphasize the toffee flavors for a "sweet and buttery" taste.
Giffard is a French company specializing in a wide variety of liqueurs and eua-de-vie among other products. Some of those extra products are flavored cocktail syrups (or "sirop"). They are generally sweetened with pure cane sugar.